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Under visible-light photoredox catalysis combined with halogen atom transfer (XAT) or hydrogen atom transfer (HAT) activation modes, these cationic alkenes react with a broad range of alkyl radical precursors. The transformation enables the modular construction of structurally diverse quaternary ammonium compounds under mild conditions. The synthetic utility of the protocol is demonstrated through cyclopropanation, late-stage functionalization, and one-pot demethylation to access tertiary amines. This work establishes alkenylammonium salts as versatile building blocks in catalytic radical chemistry, thereby expanding the synthetic strategies for the preparation of quaternary ammonium salts and tertiary alkylamines.<\/jats:p>","DOI":"10.1021\/prechem.6c00029","type":"journal-article","created":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T17:29:02Z","timestamp":1784827742000},"page":"1134-1140","source":"Crossref","is-referenced-by-count":0,"title":["Photocatalytic Radical\nFunctionalization of Alkenylammonium\nSalts"],"prefix":"10.1021","volume":"4","author":[{"given":"Aoi","family":"Yoshita","sequence":"first","affiliation":[{"name":"Kwansei Gakuin University , , Gakuen Uegahara 1 , , ,","place":["Sanda, Hyogo, Japan, 669-1330"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kohiro","family":"Shimozawa","sequence":"additional","affiliation":[{"name":"Kwansei Gakuin University , , Gakuen Uegahara 1 , , ,","place":["Sanda, Hyogo, Japan, 669-1330"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0165-3818","authenticated-orcid":true,"given":"Tomohiro","family":"Fukushima","sequence":"additional","affiliation":[{"name":"Hokkaido University , , ,","place":["Sapporo, Japan, 060-0810"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2951-8930","authenticated-orcid":true,"given":"Yota","family":"Sakakibara","sequence":"additional","affiliation":[{"name":"Kwansei Gakuin University , , Gakuen Uegahara 1 , , ,","place":["Sanda, Hyogo, Japan, 669-1330"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5405-3069","authenticated-orcid":true,"given":"Kei","family":"Murakami","sequence":"additional","affiliation":[{"name":"Kwansei Gakuin University , , Gakuen Uegahara 1 , , ,","place":["Sanda, Hyogo, Japan, 669-1330"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,7,23]]},"reference":[{"key":"2026083104362224000_cit1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejmech.2022.114765","article-title":"Antibacterial quaternary\nammonium agents: Chemical diversity and biological mechanism","volume":"243","author":"Dan","year":"2022","journal-title":"Eur. 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